Ubuntu :: 10.04 Install - Disabling UUID In Grub2 And Fstab?
Nov 25, 2010
For reasons long and unique, I want to disable UUID in my recent Ubuntu 10.4 install, and use the old fashioned /dev/sda1 /dev/sdb3 etc. method. I had this "all fixed" under GRUB (pre-2) on Ubuntu 8.04 and it has served well and bug free for years. (Warning: I use old stable hardware - others may have disasters.) But with GRUB2, the task seems more complicated. (This guide me make the backups I haven't done since the fresh install 2 weeks ago.)
Is the following process complete, necessary, and accurate...
Edit the file /etc/default/grub to remove the # in the line...
#GRUB_DISABLE_LINUX_UUID="true"
... making sure to add the two " if missing .....
Copy nearly the entire /boot/grub/grub.cfg file
into /etc/grub.d/40_custom and then...
Comment out every line that says...
search --no-floppy --fs-uuid --set (etc.)
Change every line that says...
linux /boot/vmlinuz-2.x.yy-zz-generic root=UUID=(etc.) into...
linux /boot/vmlinuz-2.x.yy-zz-generic root=/dev/sda1
Edit /etc/fstab and change every instance of UUID=(etc.)
to the appropriate drive and partition e.g. /dev/sda1
edit /etc/initramfs-tools/conf.d/resume and change RESUME=UUID=(etc.)
into RESUME=/dev/sda1
Run update-grub
Do all the above, every time I do a kernel upgrade. (Is it important to do all the above before or after rebooting for an upgrade?) Am I correct, succinct, and complete in the above process? Any mistakes? Any omissions?
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Jan 5, 2010
What would be the best way list disk and partitions in the fstab file?
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Jan 15, 2010
I've had two hd's in my box forever. for more space and backup reasons. Well I have started running the Debian Squeeze distro since December. I've had many issues, some are still unresolved. but now I'm running into major headaches with the fstab. Specifically dealing with/wondering why UUID's are used instead of the old /dev/hd? I was a little annoyed when I tried Kubuntu to find /dev/sd? used instead of /dev/hd? but that was workable. But the UUID's are a nightmare. Here's my problem.
My main box is finally giving up the ghost. The mobo is dying. So in order to do some tests I took my hd bundle (my two hard drives with their cables) physically out of the box and temp installed them in a test box. I wanted to do some benchmark and other tests. I got all kinds of errors. I found that the system wasn't recognizing the UUID's listed in fstab. My concern is when the new mobo gets here next week I won't simply be able to plug the hd's in like I always have been and just let Linux reconfigure itself (Debian used to be good about this). I really don't want to have to clean reinstall if it's not needed.
So for this I have two questions. WHY developers decided to drop using /dev/hd? or even /dev/sd? ?
And is it possible to revert fstab's listings back to the old /dev/hd? settings. In debian fstab had lines commented out showing how each partition was listed in it's /dev/hd? status during install.
I'm getting really sick of all these archane changes in ALL aspects of linux that don't seem to have any good explaination or need.
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Jan 31, 2010
all of a sudden my pc decided no to start anymore.YOu might be aware of the ide/sata driver problem, well it was the problem. I reinstalled grub with suse dvd and it went ok. Pc working properly. But then i tried to fix this once for all and changed the fstab options from /dev-by-id to uuid (all partitions : swap, /, /home etc ).Is uuid a definite solution ?Why is the pc not able to start from there ?
Since i moved the partitions with uuid option in fstab and even after reinstalling grub the pc is not starting anymore . It gives me the boot menu (linux suse/failsafe) and then a black screen left with no keyboard nor mouse available.
[Code]...
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Apr 9, 2010
I have a question about mounting partitions. I thought of using UUID or LABEL in fstab and menu.1st Is there an advantage of one over the other?
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Dec 29, 2010
Simple. UUID is apparently limited to a single UUID to be defined. Example UUID="DEB0-0001","3338-3164" separated with a comma is not working.
What could be the linux alternatives for pluging several UUID disks? How to bypass when there is a CF card and a reader box, since blkid gives no UUID ?
Code:
UUID="DEB0-0001" /media/pendrive vfat users,rw,noauto,umask=0000,uid=1000,gid=1000 0 0
#UUID="3338-3164" /media/pendrive vfat users,rw,noauto 0 0
#TYPE="vfat" /media/pendrive vfat users,rw,noauto 0 0
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Jan 2, 2010
I realized that my understanding of UUIDs in Linux to specifying hard disk partitions may be erroneous.
The proverbial wisdom is that one should not use hard-coded device specifications in fstab and in the boot menu.lst, such as /dev/sda1 etc. The reason normally given is that if hard disk order changes or the order of partitions change, then the entries will be incorrect since they are hardcoded to partitions following a specific order.
So my understanding was that using hard disk labels, in the form of LABEL=xxxx, or UUIDs in the form of UUID=some-uuid, would prevent these problems when disk order or partition order changed.
I decided to avoid the use of LABEL in case I wanted to change the LABEL on a partition to make the names of partitions more easily identifiable. I then thought that UUID was ideal since it never changed for a partition no matter even if I moved that partition to another drive or added another hard drive and thus changes the order of hard drives on my computer. I essentially thought that once UUID was determined for a partition, it never changed but was somehow part of the partition in the hardware of my computer.
Then I became curious of how a UUID was determined. I did this because I often make backups of partitions on external SATA drives and wanted to make sure that somehow the backup would not duplicate whatever Linux considers the UUID of a partition and present a Linux distribution with two UUIDS which are somehow the same and therefore confuse the Linux distribution to the point that I could not use it. I am aware that UUID means a unique id, but I wanted to make sure I understand how that unique id is determined in Linux. This is especially true since the tool I use to make backups of an entire partition is a Windows application, and not a Linux application, and I wanted to make sure that the backup partition UUID would not duplicate that of an existing partition.
In my very brief research in how a UUID is generated under Linux it appears that it is not something that is part of the hardware of the partition itself but rather a number generated by some parameters of the partition, one of which is the partition order.
If it is, it means to me that if I move a partition from one place to another, even on the same hard drive, or to another hard drive, a Linux distribution will no longer find the partition based on the UUID. In that case it seems as if the UUID is subject to the same weakness as the device specification in fstab and menu.lst in that the order of a partition or the placement of a partition on a particular hard drive will cause the designation to no longer refer to the same partition. In which case it appears to me that only the LABEL parameter is not subject to this weakness and as long as I keep distinct labels for all partitions on my hard drive I could theoretically move them around at will and a Linux distribution will find them correctly. I am aware of course that my computer must always find the boot partition to be able to boot a Linux distribution, so moving Linux parttions where I want them is subject to the ability of my computer to find them from the MBR of my hard drives. But in the main it now appears to me that the best way to insure that moving partitions does not keep a Linux distribution from botting correctly is to use LABEL, and not UUID, in fstab and menu.lst, and of course to make sure that if I decide to change the LABEL of a partition that I must change its entry in fstab and possibly menu.lst before rebooting that distribution.
If I have been wrong in my latest surmises I would appreciate being corrected, as the information I found on UUIDs and how they are generated may not be correct. Also if there is more exact information on exactly how partition UUIDs are generated in Linux I would appreciating anyone pointing it out to me.
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Nov 13, 2010
is it safe to change fstab UUID entry for the system to /dev/sdb4? and after editing fstab, is there a script or command I need to run to release lock or update mount information? edit: I see not correct, and therefore not safe,but is there a format to tell linux to use /dev/sda1 instead of UUID= or label= .
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Jul 8, 2011
I cloned one of my hard drives to another, using Acronis True Image Home 2011.In the process, of course, fstab got copied verbatim from old to new.I then, using a livecd on a flash drive, mounted the new drive, went into fstab and rewrote the UUID's, using the numbers I'd gotten previously by doing sudo blkid.Now, the new drive had the UUID's revealed by that command.Then, I used boot-repair, from yannubuntu, to make that drive bootable, since it wasn't after the cloning and after the fstab rewrite.The drive is bootable, and it's mountable from a flash drive, or from the old drive.
I can access files either way.the fstab file on the new drive still has the old numbers, yet when I ran boot-repair, it apparently changed the UUID's for sectors 1 and 5 on the new drive.fstab seems to be irrelevant at this point, yet everything I read about it indicates that it is not only relevant, but necessary.I don't understand how I can be accessing the drive when the fstab contains UUID's that are no longer pertinent to any hardware on my system.
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Apr 24, 2010
Using a M2N32-SLIDeluxe MOBO, both OS crash trying to start. It says that the timeout trying to boot from my sata device was reached.It seems that is a problem trying to boot/mount the HD by uuid, because all the other systems that does not use grub2 has problems.
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Dec 15, 2010
UUIDs make fstab hard to read, so.. Is it possible to use udev rules to prevent HDs to change device, instead of using UUID in /etc/fstab?
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Mar 22, 2010
I have a Netbook Remix install on an SD card that won't boot. Grub2 in the recovery mode shows it fails finding the root files by using UUID. It's my first Grub2 install and I'm not sure how to go about debugging it. The machine boots the same version from a USB stick.
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Feb 6, 2010
I run a headless Ubuntu 8.04 server, which acts as a web, email and file server. I am sticking with 8.04 as it is a LTS release and will upgrade to the next LTS when it is released.
I have two external USB drives, that I need to mount at boot. I have been using /etc/fstab up until now, with the following entries:
Code:
However, as I gather from doing searches is quite common, occasionally I get an error during boot (causing the system to drop to a recovery shell) because the USB drives take time to wake up and the system hasn't found them by the time it reads /etc/fstab.
From doing searches, it seems there is nothing you can do to fstab to fix this, so you need to mount them using an rc.local script instead, using:
Code:
The problem is, as I have two USB drives, their /dev/sdxx location changes between boots. I thus want to use UUID codes as I do in fstab, however I haven't found anything about this.
Does anyone know how I can use the mount command and UUID to mount a drive in rc.local and what options I have to use the mount the drive with the same options that I am using in my fstab entry? Obvisouly, I can't refer back to fstab using the mount command, because then I will still get the boot error issue if they are listed in fstab. And there is no space internally for the USB drives as there is already two internal drives.
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Jun 28, 2010
I have an SiI hardware SATA RAID card, with two 500GB disks in mirrored RAID configuration. When I first plugged them in and set it up, things seemed to work ok, but on boot the raid controller told me that the RAID needed rebuilding, and it would happen automatically after POST. So I didn't worry about it, and the drive mounted fine, and it's been that way for years. I just went in and manually on-line rebuilt the RAID in the controller's BIOS, and now when I boot into Ubuntu, both disks show up in fdisk, but neither show up in /dev/disk/by-uuid. Am I missing something?
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Dec 11, 2010
So I've a computer with a lot of disks which is running Ubuntu 9.04. The setup is made od a software raid 1 array of 200 MB for use in /boot (md0), then another raid1 array of the remaining space as a unique PV for the LVM2 vg0. This vg0 is split in many lv, for /, /usr .... and swap. A few days back, one of the raid1 disk went wrong. So as the raid is built on 160Gb disks and nobody in my town sells so little disks I bought a couple of 320GB disks. The partitioning was made like the original partitions, except that the second partition is way bigger than it was. I replaced the failed disk in the arrays, and now I've an md0 of 200 MB and an md1 of roughly 150GB as it was previously and all is in sync. This replacement was made using a rescue disk (in order to be sure that the machine was not locking anything...)
So I thought it was fine. But upon reboot on the hard disks, I get a fast GRUB message "error: no such device : <UUID ending in 4ec05>. when I start the first Ubuntu entry I get the same error. So I edit the boot entry, remove the "search --no-floppy --fs-uuid --set <UUID ending in 4ec05> " and boot the damn thing. When booted I ran :
[Code]...
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Dec 27, 2009
I have a mounting rack in which I try to plug in various HDDs. Now, all of them have vfat. Blkid returns something like:
/dev/sda7: UUID="4B16-F1E8" TYPE="vfat" The UUID looks abnormally short to me. I found no way to obtain a longer, typical UUID, and when I set Yast2 partitioner to mount by UUID, it sees and it successfully uses the short UUID. Yast2 even adds it to /etc/fstab like this: UUID=4B16-F1E8 /windows/C vfat users,gid=users,umask=0002,utf8=true 0 0 However, this short UUID is useless in /etc/fstab. It doesn't work at boot time and it doesn't work when I try to mount manually. xxxxx:~ # mount /windows/C mount: special device UUID=4B16-F1E8 does not exist. Also, one cannot find these short UUIDs in /dev/disk/by-id/.
For a billion reasons, I really want to mount these FAT32 partitions by UUID. Do I have any way to do it?
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Mar 13, 2010
I'm looking to install an nVIDIA driver (sh NVIDIA-Linux-x86_64-190.53-pkg2.run is the command I used) but it tells me I need to do it when the xfree isn't running
So what I'm looking for is a way to boot up to the command line, is that possible on SUSE 11.2?
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Nov 28, 2010
I have installed SystemD in in parallel to SysVInti(with OpenSUSE enhancements). When I starting SystemD, startpar is also running. I suppose, i should add starpar.unit to SystemD configuration. I asks for help, because I won't broke my system.
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Jan 19, 2010
I've apparently changed my fstab file and now my boot drive fails to mount. The original file is still there "fstab.BAK". How do I rename the current fstab to another name and rename the fstab.BAK to fstab? Since this is read only in the /etc directory I have not been able to make this happen from a command prompt.
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May 10, 2011
For a number of openSUSE releases now, on a periodic basis (monthly, it seems?) both my laptop and my desktop take forever to start. During this time, the hard disk activity is going berserk. When inspecting this with "iotop", a process called "preload" or "start_preload" is hammering the disk, sometimes up to 10 minutes.
The irony is when you research "preload", you find mostly articles like "drastically speed up your Linux system with preload"- I sometimes think it has to do with running VMs on these machines and maybe it's trying to cache those large disk images? Pure speculation, but I can't seem to find any documentation on this.
Anyway, I did finally find a way to turn this thing off. WARNING: since I do not know exactly what preload does and whether your machine becomes unusable if you turn it off, please only follow these instructions at your own risk. Since preload seems to be a very low-level system/service, I did not want to risk uninstalling it. What I did instead was:
Yast2 - System Services (RunLevel)
Click the Expert Mode radio button
Scroll down to the boot.startpreload entry
[code].....
Since I applied these steps, no long boot times with insane hard disk activity has occurred and I also have not noticed anything else complaining or not working with this service off.
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Aug 29, 2010
Due to my script error my boot/grub/menu.lst and etc/fstab files are ruined without being backed up first.
Anyone, the boot/grub/menu.lst and etc/fstab file of Ubuntu 10 LTS installed by default on HD (or whatever).
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Apr 18, 2011
I have been running ONLY linux (ubuntu) on my computer for years now. However, a friend sucked me back into the world of MMO's (angry fist @ RIFT). So, I decided to pick up a new disc, slap windows 7 on it and now want to dual boot.Basically I had to do some disc juggling to get windows to play nice. So my windows drive is now first, then my Ubuntu drive second.Its been a while so I'm wondering how involved / what would be the steps to get grub2 to chainload into windows7 (in my head I want to say I'm going to boot into the live cd, mount the windows disc and reinstall the loader to the windows drive since its the first disc in the chain?)
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Dec 15, 2009
I have an external hard drive that I use with my laptop and I want it to be mounted at boot. I used YaST to do this by using the Partitioner. I selected the volume, then edited then chose to have the partition mounted at boot.
On next book the computer booted up and mounted the device as I expected but the boot up process took a long time. When I would usually get the desktop I got only a black screen for about one minute, the the desktop finally loads. I tried to reboot a number of times but I still get the same delay.
When I go back and choose to have the hard drive not auto mount and then reboot there is no delay in loading the desktop. So it seems like mounting this device is delaying the loading of my desktop on boot somehow.
Below is the line that is added to my fstab file to auto mount the drive:
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Aug 11, 2010
This is an install of openSUSE-11.2 32bit. Obvoiusly, during the fresh install something went wrong. The HDD has 4 primary partitions, meant for /boot / swap /home (in that order). Instead of /home partition /dev/sda4 is mounted on /usr.
Currently it looks like this:
Code:
# fdisk -l
Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x000cbdf6
[Code]...
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Jul 13, 2009
I have already started a thred here about RAID failure: RAID5 failed, system drops into limited single mode - openSUSE Forums
I was not able to boot the system until I commented /dev/md0 in fstab
Why is it so?
This is just a files sharing partition, it is not a system partition.
Is there any option to always ignore any errors and continue boot?
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Jan 14, 2011
I have a Windows partition encrypted with TrueCrypt. If I start TrueCrypt (or RealCrypt) I can mount the partition through the GUI. before I encrypted the partition I used to auto-mount it at boot using fstab and it would appear in my places bar in the file managers. Is it possible to auto-mount truecrypt partitions from fstab?
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Apr 1, 2011
I am trying to write a script to modify /etc/fstab that will add entries for a number of partitions on different disks.
The only thing that I do not know how to do is to obtain a unique id such as the ones in /dev/disk/by-id/ to address by from a given partition (ie /dev/sdb1). In my fstab I noticed that in installation the system added fstab entries that are unique (in /dev/disk/by-id/)
I could simply do /dev/sdb1 and so on, but I would prefer a unique identifier so that each mount point is tied to a partition on a specific and unique physical drive.
i need this to be script-able if possible, if not I would still like to know.
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May 24, 2011
I just made a fresh install of OpenSUSE 11.4-Tumbleweed and have the latest updates. However fstab lines I've used in the past are not working.
Here's an example of two:
//IPADDRESS/share /home/user/mount cifs credentials=/home/user/.scripts/.creds,_netdev,uid=client_user,gid=users 0 0
//IPADDRESS/share /home/user/mount cifs guest,_netdev,uid=client_user,gid=users
I can execute a command
Code:
sudo mount /home/user/mount and it works, but I'm wanting all my fstab lines to automount at boot as on other machines.
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Mar 7, 2010
i initilally installed ubuntu 9.10 then installed windows 7 ,then i recovered grub2 using livecd as told in the post [URL] i did "sudo update-grub" and got windows 7 menu entry but when i select that entry windows 7 does not load but the grub2 is reloaded again.
i cant boot to windows 7.
Windows 7 have 100 mb partition "System Reserved" the grub2 points to that partition but still windows 7 not loaded.
sudo fdisk -l
Disk /dev/sda: 320.1 GB, 320072933376 bytes
255 heads, 63 sectors/track, 38913 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x3c3a81f5
[Code]....
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May 17, 2010
I went through so many post but I haven't found the proper answer yet hope you have an Idea1. Grub2 saves only Linux OS as last selected no Windows OS2.It is possible to boot into a cdrom (drive)?
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